package com.lvbok.gulimall.product.service.impl;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.Comparator;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.lvbok.common.utils.PageUtils;
import com.lvbok.common.utils.Query;

import com.lvbok.gulimall.product.dao.CategoryDao;
import com.lvbok.gulimall.product.entity.CategoryEntity;
import com.lvbok.gulimall.product.service.CategoryService;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {

//    @Autowired
//    CategoryDao categoryDao;


    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }

    @Override
    public List<CategoryEntity> listWithTree() {
        List<CategoryEntity> entities = baseMapper.selectList(null);
        return entities.stream()
                .filter(categoryEntity ->
                    categoryEntity.getParentCid() == 0L
                 ).map(menu -> {
                    menu.setChildren(getChildrens(menu, entities));
                    return menu;
                }).sorted(Comparator.comparingInt(CategoryEntity::getSort))
                .collect(Collectors.toList());
    }

    @Override
    public void removeMenuByIds(List<Long> asList) {
        // TODO 检查当前删除的分类是否被别的地方引用
        baseMapper.deleteBatchIds(asList);
    }

    /**
     * 递归查找所有菜单的子菜单
     * @param root
     * @param all
     * @return
     */
    private List<CategoryEntity> getChildrens(CategoryEntity root, List<CategoryEntity> all) {
        return all.stream()
                .filter(categoryEntity ->
                        categoryEntity.getParentCid().equals(root.getCatId())
                ).map(categoryEntity -> {
                        categoryEntity.setChildren(getChildrens(categoryEntity, all));
                        return categoryEntity;
                })
                .sorted(Comparator.comparingInt(CategoryEntity::getSort))
                .collect(Collectors.toList());
    }

}